Transverse Injection into Subsonic Crossflow with Various Injector Orifice Geometries

Computational and experimental results are presented for a case study of single injectors employed in 90° transverse injection into a non-reacting subsonic flow. Different injector orifice shapes are used (circular, square, diamond-shaped, and rectangular), all with equal crosssectional area, to observe the effect on injectant penetration and mixing. For the rectangular shape, four aspect ratios were used; these were also place perpendicular (wide) and along (long) the freestream direction. 3-D Reynolds-Averaged Navier-Stokes (RANS) results are obtained for the various injector geometries using the National Combustion Code (NCC) with the κ-e turbulence model on an unstructured grid. Whereas the circular, square, and diamond injectors produce similar jet plumes, the wide rectangular slot produces a plume with less vertical penetration than the others. Both experimental and computational data show improved plume penetration with the long rectangular configuration.